Sky router thoroughly dead. Replacement costs £71. About to threaten to cancel, to see if they will give one out free. If that fails, will cancel and get girly to sign up with Sky under her name. To anyone that knows, is there something wrong with my cunning plan? Is there something in the small print that will stop her from signing up, as soon as I cancel?

We've had their bog-standard broadband for a few years with no complaints, but fibre has now (finally) arrived in our town. Our exchange is a sky LLU, so i figure we'd be as well stick with them, but maybe infinity is the better option?

You should be able to get a Sky fibre package, the only major difference between the two is that in some locations you can get up to 300/20Mb on BT and they offer BT Sport for free if you're interested in that.

Might be cheaper to stick with Sky if you aren't too fussed about the faster speeds (if available in your area).